Compact Broad Band-Stop Filter with Circular Fractal-Shaped Stubs for X-Band Radar Applications
Keywords:
Band-stop filter, circular fractal-shaped stubs, defected ground plane, X-band applicationsAbstract
In this letter, we use the fractal structures to design a novel compact band-stop filter with prominent cut-off sharpness and wide stop-band for X-band applications. By cutting five U-shaped slots on the ground plane and by inserting five Fractal- Shaped stubs in the microstrip transmission line, the proposed structure is created hence a constant and flat impedance bandwidth at the X-band can be produced. The operating frequencies of the filter can be easily controlled by changing the protruded fractal-shaped stubs dimensions, without changing the area taken by the structure. The experimental results show good agreement with simulation results and demonstrate that excellent stop-band performance could be obtained through the proposed band stop filter.
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References
D. S. La, Y. H. Lu, S. Y. Sun, N. Liu, and J. L. Zhang, “A novel compact bandstop filter using defected microstrip structure,” Microw. Opt. Tech. Lett., vol. 53, pp. 433-435, Feb. 2011.
X.-H. Wang, B.-Z. Wang, H. Zhang, and K. J. Chen, “A tunable band-stop resonator based on a compact slotted ground structure,” IEEE Trans Microwave Theory Tech., vol. 55 pp. 1912-1918, 2007.
A. Faraghi, M. N. Azarmanesh, and M. Ojaroudi, “Small microstrip low-pass filter by using novel defected ground structure for UWB applications,” Applied Computational Electromagnetics Society (ACES) Journal, vol. 28, no. 4, pp. 341-347, Apr. 2013.
J Mazloum, A Jalali, and M Ojaroudi, “Miniaturized reconfigurable band-pass filter with electronically controllable for WiMAX/WLAN applications,” Microwave and Optical Technology Letters, vol. 56, no. 2, pp. 509-512, 2014.
L. H. Weng, Y. C. Guo, X. W. Shi, and X. Q. Chen, “An overview on defected ground structure,” Progress In Electromagnetics Research B, vol. 7, pp. 173-189, 2008.
W. D. Yan and R. R. Mansour, “Compact tunable bandstop filter integrated with large deflected actuators,” IEEE MTT-S International Microwave Symposium, Honolulu, HI, pp. 1611-1614, 2007.
Ansoft Corporation, Ansoft High Frequency Structure Simulation (HFSS), Ver. 13, Ansoft Corporation, Pittsburgh, PA, 2010.
S. Pirani, J. Nourinia, and C. ghobadi, “Design of a small modified microstrip lowpass filter with folded U-shaped defected ground structure,” 18th Iranian Conference on Electrical Engineering (ICEE), Tehran, 2011.
M. Ojaroudi, N. Ojaroudi, R. Habibi, and H. Ebrahimian, “Microstrip low-pass filters by using novel defected ground structure slot with a pair of protruded T-shaped strips inside the slot,” Advanced Electromagnetic Symposium, AES 2012, Paris, France, Apr. 16-19, 2012.
M. Pourbagher, N. Ojaroudi, J. Nourinia, and C. Ghobadi, “Compact band-stop filter for X-band transceiver in radar applications,” Applied Computational Electromagnetics Society (ACES) Journal, vol. 30, no. 4, pp. 423-428, Apr. 2015.
A Faraghi, M. Ojaroudi, and N. Ghadimi, “Compact microstrip low-pass filter with sharp selection characteristics using triple novel defected structures for UWB applications,” Microwave and Optical Technology Letters, vol. 56, no. 4, pp. 1007-1010, 2014.
